Peters



(No Model.)

T. HYATT. ILLUMINATING GRATING 0R VAULT'GOVER. No. 257,713.

Patented May 9 INVENTOR (41m N. PETERS, HMo-Lilhognphflr. Washington, D. C

UNITED STATES PATENT OFFICE.

THADDEUS HY-ATT, OF NEW YORK, N. Y., ASSIGNOR TO ELIZABETH ADELAIDE LAKE HYATT, OF SAME PLACE.

ILLUMINATING GRATING OR VAULT-COVER.

SPEGIFIGATION forming part of Letters Patent No. 257,713, dated May 9, 1882. Application filed April 11, 1862. (No modell To all whom it may concern.

Be it known that I, THADDEUS HYATT, of the city, county, and State, of New York, and a citizen of the United States, have invented certain new and useful Improvements in IlluminatingGratings and Vault-Covers, of which the following is a specification.

Like letters refer to like parts in all the figures of the drawings attached hereto and making part of this specification.

The object of my improvement is to guarantee a perpetually safe foots'urface to thatclass of vaultcovers and illuminatinggratings known to the trade by the name of knoblights, the safety ot' which'as a foot-surface to be Walked upon in the public streets depends upon knobs or protuberanees of metal made upon the face of the grating between the glasses. These lights, so long as the knobs remain, may be walked upon with safety but when worn off the metal becomes polished and dangerous and the addition of fresh knobs a source of expense and trouble.

Figure 1 represents in cross-section a knoblight of the ordinary construction. A A is the iron grating; 13 B, the glasses; an, the knobs or iron protu beraucrs.

Fig. 2 represents the same after the knobs and glasses have been worn down. a a represent the iron surface now polished and danlic cement, concrete, or artificial stone, above the face of which rise the metal knobs to propurpose I employ a mold-board or facing-plateas the bottom of the mold which is made with indentsor holes to let the knobs sink into to the depth they are required to stand abovethe level of the concrete when the work is completed; also,I prefer to make the mold-board with cores to form the light-holes in the body of concrete, so as to set the glasses after the concrete has turned to stone.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. An improved concrete light made by combining lens-shaped glasses with concrete and protecting metallic knobs, substantially as and for the purposes herein set forth and illustrated.

2. An improved concretelight made by combining protecting metallic knobs with the concrete and glasses, substantially as and for the purposes herein set forth and illustrated.

3. An improved knob-light made by combining with the glasses and knobs a non-slipping or foot-holdin g material which practically surrounds both glasses and knobs, substantially as and for the purposes herein set forth and illustrated.

T. G. Bnncrrr, LLOYD I KELEHER. 

